src/arch/arm/isa/formats/misc.isa - public/gem5 - Git at Google

 // -*- mode:c++ -*-

 // Copyright (c) 2010-2013,2016-2018 ARM Limited
 // All rights reserved
 //
 // The license below extends only to copyright in the software and shall
 // not be construed as granting a license to any other intellectual
 // property including but not limited to intellectual property relating
 // to a hardware implementation of the functionality of the software
 // licensed hereunder.  You may use the software subject to the license
 // terms below provided that you ensure that this notice is replicated
 // unmodified and in its entirety in all distributions of the software,
 // modified or unmodified, in source code or in binary form.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met: redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer;
 // redistributions in binary form must reproduce the above copyright
 // notice, this list of conditions and the following disclaimer in the
 // documentation and/or other materials provided with the distribution;
 // neither the name of the copyright holders nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 def format Crc32() {{
     decode_block = '''
     {
         const IntRegIndex rm = (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
         const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
         const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);

         uint8_t c_poly = bits(machInst, 9);
         uint8_t sz = bits(machInst, 22, 21);
         uint8_t crc_select = (c_poly << 2) | sz;

         switch(crc_select) {
           case 0x0:
             return new Crc32b(machInst, rd, rn, rm);
           case 0x1:
             return new Crc32h(machInst, rd, rn, rm);
           case 0x2:
             return new Crc32w(machInst, rd, rn, rm);
           case 0x4:
             return new Crc32cb(machInst, rd, rn, rm);
           case 0x5:
             return new Crc32ch(machInst, rd, rn, rm);
           case 0x6:
             return new Crc32cw(machInst, rd, rn, rm);
           default:
             return new Unknown(machInst);
         }
     }
     '''
 }};

 def format ArmERet() {{
     decode_block = "return new Eret(machInst);"
 }};

 def format Svc() {{
     decode_block = "return new Svc(machInst, bits(machInst, 23, 0));"
 }};

 def format ArmSmcHyp() {{
     decode_block = '''
     {
         if (bits(machInst, 21))
         {
             return new Smc(machInst);
         } else {
             uint32_t imm16 = (bits(machInst, 19, 8) << 4) |
                              (bits(machInst,  3, 0) << 0);
             return new Hvc(machInst, imm16);
         }
     }
     '''
 }};

 def format ArmMsrMrs() {{
     decode_block = '''
     {
         const uint8_t byteMask = bits(machInst, 19, 16);
         const uint8_t sysM     = byteMask | (bits(machInst, 8) << 4);
         const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
         const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
         const uint32_t opcode = bits(machInst, 24, 21);
         const bool useImm = bits(machInst, 25);
         const bool r      = bits(machInst, 22);
         const bool isBanked = bits(machInst, 9);

         const uint32_t unrotated = bits(machInst, 7, 0);
         const uint32_t rotation = (bits(machInst, 11, 8) << 1);
         const uint32_t imm = rotate_imm(unrotated, rotation);

         switch (opcode) {
           case 0x8:
             if (isBanked) {
                 return new MrsBankedReg(machInst, rd, sysM, r!=0);
             } else {
                 return new MrsCpsr(machInst, rd);
             }
           case 0x9:
             if (useImm) {
                 return new MsrCpsrImm(machInst, imm, byteMask);
             } else {
                 if (isBanked) {
                     return new MsrBankedReg(machInst, rn, sysM, r!=0);
                 } else {
                     return new MsrCpsrReg(machInst, rn, byteMask);
                 }
             }
           case 0xa:
             if (isBanked) {
                 return new MrsBankedReg(machInst, rd, sysM, r!=0);
             } else {
                 return new MrsSpsr(machInst, rd);
             }
           case 0xb:
             if (useImm) {
                 return new MsrSpsrImm(machInst, imm, byteMask);
             } else {
                 if (isBanked) {
                     return new MsrBankedReg(machInst, rn, sysM, r!=0);
                 } else {
                     return new MsrSpsrReg(machInst, rn, byteMask);
                 }
             }
           default:
             return new Unknown(machInst);
         }
     }
     '''
 }};

 let {{
     header_output = '''
     StaticInstPtr
     decodeMcrMrc14(ExtMachInst machInst);
     '''
     decoder_output = '''
     StaticInstPtr
     decodeMcrMrc14(ExtMachInst machInst)
     {
         const uint32_t opc1 = bits(machInst, 23, 21);
         const uint32_t crn = bits(machInst, 19, 16);
         const uint32_t opc2 = bits(machInst, 7, 5);
         const uint32_t crm = bits(machInst, 3, 0);
         const MiscRegIndex miscReg = decodeCP14Reg(crn, opc1, crm, opc2);
         const IntRegIndex rt = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);

         const bool isRead = bits(machInst, 20);

         switch (miscReg) {
           case MISCREG_NOP:
             return new NopInst(machInst);
           case MISCREG_CP14_UNIMPL:
             return new FailUnimplemented(isRead ? "mrc unknown" : "mcr unknown",
                     machInst,
                     csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s unknown",
                     crn, opc1, crm, opc2, isRead ? "read" : "write"));
           default:
             uint32_t iss = mcrMrcIssBuild(isRead, crm, rt, crn, opc1, opc2);
             if (isRead) {
                 return new Mrc14(machInst, rt, miscReg, iss);
             } else {
                 return new Mcr14(machInst, miscReg, rt, iss);
             }
         }
     }
     '''
 }};

 def format McrMrc14() {{
     decode_block = '''
     return decodeMcrMrc14(machInst);
     '''
 }};

 let {{
     header_output = '''
     StaticInstPtr decodeMcrMrc14(ExtMachInst machInst);
     StaticInstPtr decodeMcrMrc15(ExtMachInst machInst);
     '''
     decoder_output = '''
     StaticInstPtr
     decodeMcrMrc15(ExtMachInst machInst)
     {
         const uint32_t opc1 = bits(machInst, 23, 21);
         const uint32_t crn = bits(machInst, 19, 16);
         const uint32_t opc2 = bits(machInst, 7, 5);
         const uint32_t crm = bits(machInst, 3, 0);
         const MiscRegIndex miscReg = decodeCP15Reg(crn, opc1, crm, opc2);
         const IntRegIndex rt = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
         const bool isRead = bits(machInst, 20);
         uint32_t iss = mcrMrcIssBuild(isRead, crm, rt, crn, opc1, opc2);

         switch (miscReg) {
           case MISCREG_NOP:
             return new McrMrcMiscInst(isRead ? "mrc nop" : "mcr nop",
                                       machInst, iss, MISCREG_NOP);
           case MISCREG_CP15_UNIMPL:
             return new FailUnimplemented(isRead ? "mrc unkown" : "mcr unkown",
                     machInst,
                     csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s unknown",
                     crn, opc1, crm, opc2, isRead ? "read" : "write"));
           case MISCREG_IMPDEF_UNIMPL:

             if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
                 auto mnemonic =
                     csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s",
                              crn, opc1, crm, opc2, isRead ? "read" : "write");

                 return new WarnUnimplemented(
                     isRead ? "mrc implementation defined" :
                              "mcr implementation defined",
                     machInst, mnemonic + " treated as NOP");
             } else {
                 return new McrMrcImplDefined(
                     isRead ? "mrc implementation defined" :
                              "mcr implementation defined",
                     machInst, iss, MISCREG_IMPDEF_UNIMPL);
             }
           case MISCREG_CP15ISB:
             return new Isb(machInst, iss);
           case MISCREG_CP15DSB:
             return new Dsb(machInst, iss);
           case MISCREG_CP15DMB:
             return new Dmb(machInst, iss);
           case MISCREG_DCIMVAC:
             return new McrDcimvac(machInst, miscReg, rt, iss);
           case MISCREG_DCCMVAC:
             return new McrDccmvac(machInst, miscReg, rt, iss);
           case MISCREG_DCCMVAU:
             return new McrDccmvau(machInst, miscReg, rt, iss);
           case MISCREG_DCCIMVAC:
             return new McrDccimvac(machInst, miscReg, rt, iss);
           default:
             if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
                 std::string full_mnem = csprintf("%s %s",
                     isRead ? "mrc" : "mcr", miscRegName[miscReg]);
                 warn("\\tinstruction '%s' unimplemented\\n", full_mnem);

                 // Remove the warn flag and set the implemented flag. This
                 // prevents the instruction warning a second time, it also
                 // means the instruction is actually generated. Actually
                 // creating the instruction to access an register that isn't
                 // implemented sounds a bit silly, but its required to get
                 // the correct behaviour for hyp traps and undef exceptions.
                 miscRegInfo[miscReg][MISCREG_IMPLEMENTED]   = true;
                 miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL] = false;
             }

             if (miscRegInfo[miscReg][MISCREG_IMPLEMENTED]) {
                 if (isRead)
                     return new Mrc15(machInst, rt, miscReg, iss);
                 return new Mcr15(machInst, miscReg, rt, iss);
             } else {
                 return new FailUnimplemented(isRead ? "mrc" : "mcr", machInst,
                     csprintf("%s %s", isRead ? "mrc" : "mcr",
                         miscRegName[miscReg]));
             }
         }
     }
     '''
 }};

 def format McrMrc15() {{
     decode_block = '''
     return decodeMcrMrc15(machInst);
     '''
 }};

 let {{
     header_output = '''
     StaticInstPtr
     decodeMcrrMrrc15(ExtMachInst machInst);
     '''
     decoder_output = '''
     StaticInstPtr
     decodeMcrrMrrc15(ExtMachInst machInst)
     {
         const uint32_t crm = bits(machInst, 3, 0);
         const uint32_t opc1 = bits(machInst, 7, 4);
         const MiscRegIndex miscReg = decodeCP15Reg64(crm, opc1);
         const IntRegIndex rt = (IntRegIndex) (uint32_t) bits(machInst, 15, 12);
         const IntRegIndex rt2 = (IntRegIndex) (uint32_t) bits(machInst, 19, 16);

         const bool isRead = bits(machInst, 20);

         switch (miscReg) {
           case MISCREG_CP15_UNIMPL:
             return new FailUnimplemented(isRead ? "mrc" : "mcr", machInst,
                     csprintf("miscreg crm:%d opc1:%d 64-bit %s unknown",
                     crm, opc1, isRead ? "read" : "write"));
           default:
             if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
                 std::string full_mnem = csprintf("%s %s",
                     isRead ? "mrrc" : "mcrr", miscRegName[miscReg]);
                 warn("\\tinstruction '%s' unimplemented\\n", full_mnem);

                 // Remove the warn flag and set the implemented flag. This
                 // prevents the instruction warning a second time, it also
                 // means the instruction is actually generated. Actually
                 // creating the instruction to access an register that isn't
                 // implemented sounds a bit silly, but its required to get
                 // the correct behaviour for hyp traps and undef exceptions.
                 miscRegInfo[miscReg][MISCREG_IMPLEMENTED]   = true;
                 miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL] = false;
             }

             if (miscRegInfo[miscReg][MISCREG_IMPLEMENTED]) {
                 uint32_t iss = mcrrMrrcIssBuild(isRead, crm, rt, rt2, opc1);

                 if (isRead) {
                     StaticInstPtr si =  new Mrrc15(machInst, miscReg, rt2, rt, iss);
                     if (miscRegInfo[miscReg][MISCREG_UNVERIFIABLE])
                         si->setFlag(StaticInst::IsUnverifiable);
                     return si;
                 }
                 return new Mcrr15(machInst, rt2, rt, miscReg, iss);
             } else {
                 return new FailUnimplemented(isRead ? "mrrc" : "mcrr", machInst,
                     csprintf("%s %s",
                     isRead ? "mrrc" : "mcrr", miscRegName[miscReg]));
             }
         }
     }
     '''
 }};

 def format Mcrr15() {{
     decode_block = '''
     return decodeMcrrMrrc15(machInst);
     '''
 }};

 def format Mrrc15() {{
     decode_block = '''
     return decodeMcrrMrrc15(machInst);
     '''
 }};

 def format Gem5Op() {{
     decode_block = '''
     return new Gem5Op(machInst);
     '''
 }};
	// -- mode:c++ --

	// Copyright (c) 2010-2013,2016-2018 ARM Limited
	// All rights reserved
	//
	// The license below extends only to copyright in the software and shall
	// not be construed as granting a license to any other intellectual
	// property including but not limited to intellectual property relating
	// to a hardware implementation of the functionality of the software
	// licensed hereunder. You may use the software subject to the license
	// terms below provided that you ensure that this notice is replicated
	// unmodified and in its entirety in all distributions of the software,
	// modified or unmodified, in source code or in binary form.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met: redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer;
	// redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in the
	// documentation and/or other materials provided with the distribution;
	// neither the name of the copyright holders nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	def format Crc32() {{
	decode_block = '''
	{
	const IntRegIndex rm = (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
	const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
	const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);

	uint8_t c_poly = bits(machInst, 9);
	uint8_t sz = bits(machInst, 22, 21);
	uint8_t crc_select = (c_poly << 2) \| sz;

	switch(crc_select) {
	case 0x0:
	return new Crc32b(machInst, rd, rn, rm);
	case 0x1:
	return new Crc32h(machInst, rd, rn, rm);
	case 0x2:
	return new Crc32w(machInst, rd, rn, rm);
	case 0x4:
	return new Crc32cb(machInst, rd, rn, rm);
	case 0x5:
	return new Crc32ch(machInst, rd, rn, rm);
	case 0x6:
	return new Crc32cw(machInst, rd, rn, rm);
	default:
	return new Unknown(machInst);
	}
	}
	'''
	}};

	def format ArmERet() {{
	decode_block = "return new Eret(machInst);"
	}};

	def format Svc() {{
	decode_block = "return new Svc(machInst, bits(machInst, 23, 0));"
	}};

	def format ArmSmcHyp() {{
	decode_block = '''
	{
	if (bits(machInst, 21))
	{
	return new Smc(machInst);
	} else {
	uint32_t imm16 = (bits(machInst, 19, 8) << 4) \|
	(bits(machInst, 3, 0) << 0);
	return new Hvc(machInst, imm16);
	}
	}
	'''
	}};

	def format ArmMsrMrs() {{
	decode_block = '''
	{
	const uint8_t byteMask = bits(machInst, 19, 16);
	const uint8_t sysM = byteMask \| (bits(machInst, 8) << 4);
	const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
	const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
	const uint32_t opcode = bits(machInst, 24, 21);
	const bool useImm = bits(machInst, 25);
	const bool r = bits(machInst, 22);
	const bool isBanked = bits(machInst, 9);

	const uint32_t unrotated = bits(machInst, 7, 0);
	const uint32_t rotation = (bits(machInst, 11, 8) << 1);
	const uint32_t imm = rotate_imm(unrotated, rotation);

	switch (opcode) {
	case 0x8:
	if (isBanked) {
	return new MrsBankedReg(machInst, rd, sysM, r!=0);
	} else {
	return new MrsCpsr(machInst, rd);
	}
	case 0x9:
	if (useImm) {
	return new MsrCpsrImm(machInst, imm, byteMask);
	} else {
	if (isBanked) {
	return new MsrBankedReg(machInst, rn, sysM, r!=0);
	} else {
	return new MsrCpsrReg(machInst, rn, byteMask);
	}
	}
	case 0xa:
	if (isBanked) {
	return new MrsBankedReg(machInst, rd, sysM, r!=0);
	} else {
	return new MrsSpsr(machInst, rd);
	}
	case 0xb:
	if (useImm) {
	return new MsrSpsrImm(machInst, imm, byteMask);
	} else {
	if (isBanked) {
	return new MsrBankedReg(machInst, rn, sysM, r!=0);
	} else {
	return new MsrSpsrReg(machInst, rn, byteMask);
	}
	}
	default:
	return new Unknown(machInst);
	}
	}
	'''
	}};

	let {{
	header_output = '''
	StaticInstPtr
	decodeMcrMrc14(ExtMachInst machInst);
	'''
	decoder_output = '''
	StaticInstPtr
	decodeMcrMrc14(ExtMachInst machInst)
	{
	const uint32_t opc1 = bits(machInst, 23, 21);
	const uint32_t crn = bits(machInst, 19, 16);
	const uint32_t opc2 = bits(machInst, 7, 5);
	const uint32_t crm = bits(machInst, 3, 0);
	const MiscRegIndex miscReg = decodeCP14Reg(crn, opc1, crm, opc2);
	const IntRegIndex rt = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);

	const bool isRead = bits(machInst, 20);

	switch (miscReg) {
	case MISCREG_NOP:
	return new NopInst(machInst);
	case MISCREG_CP14_UNIMPL:
	return new FailUnimplemented(isRead ? "mrc unknown" : "mcr unknown",
	machInst,
	csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s unknown",
	crn, opc1, crm, opc2, isRead ? "read" : "write"));
	default:
	uint32_t iss = mcrMrcIssBuild(isRead, crm, rt, crn, opc1, opc2);
	if (isRead) {
	return new Mrc14(machInst, rt, miscReg, iss);
	} else {
	return new Mcr14(machInst, miscReg, rt, iss);
	}
	}
	}
	'''
	}};

	def format McrMrc14() {{
	decode_block = '''
	return decodeMcrMrc14(machInst);
	'''
	}};

	let {{
	header_output = '''
	StaticInstPtr decodeMcrMrc14(ExtMachInst machInst);
	StaticInstPtr decodeMcrMrc15(ExtMachInst machInst);
	'''
	decoder_output = '''
	StaticInstPtr
	decodeMcrMrc15(ExtMachInst machInst)
	{
	const uint32_t opc1 = bits(machInst, 23, 21);
	const uint32_t crn = bits(machInst, 19, 16);
	const uint32_t opc2 = bits(machInst, 7, 5);
	const uint32_t crm = bits(machInst, 3, 0);
	const MiscRegIndex miscReg = decodeCP15Reg(crn, opc1, crm, opc2);
	const IntRegIndex rt = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
	const bool isRead = bits(machInst, 20);
	uint32_t iss = mcrMrcIssBuild(isRead, crm, rt, crn, opc1, opc2);

	switch (miscReg) {
	case MISCREG_NOP:
	return new McrMrcMiscInst(isRead ? "mrc nop" : "mcr nop",
	machInst, iss, MISCREG_NOP);
	case MISCREG_CP15_UNIMPL:
	return new FailUnimplemented(isRead ? "mrc unkown" : "mcr unkown",
	machInst,
	csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s unknown",
	crn, opc1, crm, opc2, isRead ? "read" : "write"));
	case MISCREG_IMPDEF_UNIMPL:

	if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
	auto mnemonic =
	csprintf("miscreg crn:%d opc1:%d crm:%d opc2:%d %s",
	crn, opc1, crm, opc2, isRead ? "read" : "write");

	return new WarnUnimplemented(
	isRead ? "mrc implementation defined" :
	"mcr implementation defined",
	machInst, mnemonic + " treated as NOP");
	} else {
	return new McrMrcImplDefined(
	isRead ? "mrc implementation defined" :
	"mcr implementation defined",
	machInst, iss, MISCREG_IMPDEF_UNIMPL);
	}
	case MISCREG_CP15ISB:
	return new Isb(machInst, iss);
	case MISCREG_CP15DSB:
	return new Dsb(machInst, iss);
	case MISCREG_CP15DMB:
	return new Dmb(machInst, iss);
	case MISCREG_DCIMVAC:
	return new McrDcimvac(machInst, miscReg, rt, iss);
	case MISCREG_DCCMVAC:
	return new McrDccmvac(machInst, miscReg, rt, iss);
	case MISCREG_DCCMVAU:
	return new McrDccmvau(machInst, miscReg, rt, iss);
	case MISCREG_DCCIMVAC:
	return new McrDccimvac(machInst, miscReg, rt, iss);
	default:
	if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
	std::string full_mnem = csprintf("%s %s",
	isRead ? "mrc" : "mcr", miscRegName[miscReg]);
	warn("\\tinstruction '%s' unimplemented\\n", full_mnem);

	// Remove the warn flag and set the implemented flag. This
	// prevents the instruction warning a second time, it also
	// means the instruction is actually generated. Actually
	// creating the instruction to access an register that isn't
	// implemented sounds a bit silly, but its required to get
	// the correct behaviour for hyp traps and undef exceptions.
	miscRegInfo[miscReg][MISCREG_IMPLEMENTED] = true;
	miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL] = false;
	}

	if (miscRegInfo[miscReg][MISCREG_IMPLEMENTED]) {
	if (isRead)
	return new Mrc15(machInst, rt, miscReg, iss);
	return new Mcr15(machInst, miscReg, rt, iss);
	} else {
	return new FailUnimplemented(isRead ? "mrc" : "mcr", machInst,
	csprintf("%s %s", isRead ? "mrc" : "mcr",
	miscRegName[miscReg]));
	}
	}
	}
	'''
	}};

	def format McrMrc15() {{
	decode_block = '''
	return decodeMcrMrc15(machInst);
	'''
	}};

	let {{
	header_output = '''
	StaticInstPtr
	decodeMcrrMrrc15(ExtMachInst machInst);
	'''
	decoder_output = '''
	StaticInstPtr
	decodeMcrrMrrc15(ExtMachInst machInst)
	{
	const uint32_t crm = bits(machInst, 3, 0);
	const uint32_t opc1 = bits(machInst, 7, 4);
	const MiscRegIndex miscReg = decodeCP15Reg64(crm, opc1);
	const IntRegIndex rt = (IntRegIndex) (uint32_t) bits(machInst, 15, 12);
	const IntRegIndex rt2 = (IntRegIndex) (uint32_t) bits(machInst, 19, 16);

	const bool isRead = bits(machInst, 20);

	switch (miscReg) {
	case MISCREG_CP15_UNIMPL:
	return new FailUnimplemented(isRead ? "mrc" : "mcr", machInst,
	csprintf("miscreg crm:%d opc1:%d 64-bit %s unknown",
	crm, opc1, isRead ? "read" : "write"));
	default:
	if (miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL]) {
	std::string full_mnem = csprintf("%s %s",
	isRead ? "mrrc" : "mcrr", miscRegName[miscReg]);
	warn("\\tinstruction '%s' unimplemented\\n", full_mnem);

	// Remove the warn flag and set the implemented flag. This
	// prevents the instruction warning a second time, it also
	// means the instruction is actually generated. Actually
	// creating the instruction to access an register that isn't
	// implemented sounds a bit silly, but its required to get
	// the correct behaviour for hyp traps and undef exceptions.
	miscRegInfo[miscReg][MISCREG_IMPLEMENTED] = true;
	miscRegInfo[miscReg][MISCREG_WARN_NOT_FAIL] = false;
	}

	if (miscRegInfo[miscReg][MISCREG_IMPLEMENTED]) {
	uint32_t iss = mcrrMrrcIssBuild(isRead, crm, rt, rt2, opc1);

	if (isRead) {
	StaticInstPtr si = new Mrrc15(machInst, miscReg, rt2, rt, iss);
	if (miscRegInfo[miscReg][MISCREG_UNVERIFIABLE])
	si->setFlag(StaticInst::IsUnverifiable);
	return si;
	}
	return new Mcrr15(machInst, rt2, rt, miscReg, iss);
	} else {
	return new FailUnimplemented(isRead ? "mrrc" : "mcrr", machInst,
	csprintf("%s %s",
	isRead ? "mrrc" : "mcrr", miscRegName[miscReg]));
	}
	}
	}
	'''
	}};

	def format Mcrr15() {{
	decode_block = '''
	return decodeMcrrMrrc15(machInst);
	'''
	}};

	def format Mrrc15() {{
	decode_block = '''
	return decodeMcrrMrrc15(machInst);
	'''
	}};

	def format Gem5Op() {{
	decode_block = '''
	return new Gem5Op(machInst);
	'''
	}};